Use the Passthrough beta feature on standalone Quest 2 headsets and Pico Neo 3 headsets and work in Gravity Sketch while seeing your surroundings. This way you will get a better image of what the model you are creating would look like in real space (when on a 1:1 scale).
To enable it:
1. Move your controller close to your headset and a purple rectangle will appear
2. Press and hold the grab trigger on your controller and move the controller away from your headset
3. Release the grab trigger
4. This will enable the passthrough environment
To disable Passthrough, repeat the gesture.